What is the speed limit in any urban district in Mississippi unless otherwise posted?

Answer: B — 25 mph

In any urban district in Mississippi, the speed limit is typically set at 25 mph unless otherwise posted. This speed limit is a standard safety measure in urban areas where there are more pedestrians, cyclists, and vehicles in close proximity. It allows for better traffic flow, reduces the risk of accidents, and provides a safer environment for everyone on the road. It's important for drivers to be aware of and abide by this speed limit to ensure the safety of themselves and others.